Freebore at end of chamber is not considered by many to be best for accuracy- the rifling should just touch bullet or just slightest of interference fit is what many benchrest shooters prefer. Problem is what happens when a larger,longer bullet is used? Freebore allows heaviest bullets to be used, slight reduction in pressure for shorter bullets and slight chew of bullet after its short jump to engage rifling. Ruger mini30 supossed to have a bit of freebore on its .308 barrel- allows the use of other than american ammo using .310/311 bullets safely. The old .300 H&H long taper was designed by engineers worried about possible fouling in chamber causing feed problems while hunting sometimes dangerous game- reliability was important. Cordite mix of nitrocellulose, Nitroglycerin and petroleum gel was hot, reliable burner but still had corrosive fouling properties especially with corrosive mercuric primers of the time. Since head spacing on shoulder wasn"t a problem with the "flanged" cartridge the extra forward chamber space was not concern, the extra space was a plus on extracting fired shell after brass returned closer to original diameter, Blish principal retention of case in chamber not wanted. As for overbore? Maybe, best balanced cartridge in .30 may have been the old .300 Savage. RN
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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